﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo1
{
    class Shape
    {
        private string color;
        public string Color 
        {
            get { return this.color; }
            set { this.color = value; }
        }

        public virtual void GetArea(double a) 
        {
            Console.WriteLine("进行计算中");
        }




    }
}
